Kostyantin

Kostyantin Klishchuk
Android Developer
Odesa, Ukraine

Android Developer with 5 years of experience building scalable production applications. Skilled in designing Android
architecture from scratch, working with large modular codebases, and introducing modern development
approaches. Strong knowledge of Kotlin and the Android ecosystem, including Jetpack Compose and modern
architecture patterns. Comfortable owning technical decisions and mentoring developers.

Contacts Experience
Phone [open contact info](look above in the "contact info" section) Octy - Android Developer (Aug 2021 - Jun 2026)
E-mail [open contact info](look above in the "contact info" section)
Pick my brain (Jul 2022 - Jun 2026)
Telegram @Konstantin13k
AI-powered app for chatting with digital twins and creating your own.
LinkedIn
Designed the app architecture from scratch: MVI, 200+ Gradle modules.
GitHub
Onboarded and mentored new developers; took an active part in
architectural decisions and code review.
Skills Built the AI chat end to end: streaming via GraphQL subscriptions, smart
auto-scroll, and a Telegram-style input panel combining the system
Android SDK
keyboard with a custom picker.
Java, Kotlin
Migrated screens from XML to Jetpack Compose.
OOP, SOLID
Implemented subscriptions with Adapty 3.
MVI, MVVM, MVP
Introduced Detekt with a custom config and pre-push hook; consolidated
REST (Retrofit, OkHttp)
Gradle convention plugins.
GraphQL (Apollo)
Kotlin, Jetpack Compose, MVI, Multimodule, Dagger 2, Apollo GraphQL,
DI (Dagger 2, Hilt) Coroutines/Flow, Jetpack Navigation, Room, DataStore, Media3, WorkManager,
Kotlin Coroutines, Flow Adapty, Detekt
Android Jetpack:
Sidekick (Feb 2022 - Nov 2022)
Jetpack Compose,
Social fitness app for working out together with other users.
ViewModel, Navigation,
LiveData, Room, Designed a multimodule architecture (60+ modules) with custom
Media 3, DataStore, Dagger-based DI.
Paging 3, WorkManager Built a Tinder-style card stack with a custom RecyclerView
Custom Views LayoutManager.
Google Play Billing, Adapty Created a UI kit of custom views: audio waveform, PIN code input,
Firebase progress avatar.
Google Maps Implemented background location tracking during workouts (foreground
Detekt service) for a safety feature.
Git Implemented Google Play Billing subscriptions and the paywall.
AI: Claude, ChatGPT, Gemini Kotlin, Coroutines/Flow, MVVM, Multimodule, Dagger 2, Retrofit, Google Maps,
Google Play Billing, Firebase

Languages Limefox (Nov 2021 - Feb 2022)
Restaurant discovery app, built from scratch.
English (Intermediate)
Kotlin, MVVM, Hilt, Retrofit, Coroutines, Room, Google Maps, Firebase
Ukrainian (Native)
Relaxo (Aug 2021 - Nov 2021)
Meditation app; added features and fixed bugs in an existing Java/RxJava
codebase.
Java, MVP, RxJava 2, Retrofit 2, LiveData, Facebook SDK

Education
Android Academy (2021)
Fundamentals course; Hackathon: team of 5, built an app showing nearby
places.
Medical Institute (2017 - 2021)
Bachelor's degree in Pharmacy, Industrial Pharmacy